Mosaic Minerals (CSE:MOC) has started a diamond drilling campaign of at least 2,000m at its Golden Island Gold Project in Québec, Canada.
The drill rig and crew are now on the island, with the program covering about a dozen holes. It aims to test the down-dip extensions of ‘high-grade’ vein systems identified in trenches at depths of 150–300m.
The campaign follows assays for 343 samples from the summer 2026 program in the Abitibi region. The best results returned 72.79 grams per tonne gold (Au) and 66.92g/t Au, with the first sample also carrying 42.5g/t silver and 0.42% copper.
Nine samples assayed above 10g/t Au, 17 exceeded 5g/t Au. Meanwhile, 45 samples, or 13% of the total, topped 1g/t Au. Initial results showed high variability, prompting metallic screen re-assays that confirmed coarse gold, with fractions grading up to 2,842g/t Au.
The samples came from mechanical stripping and the cleaning of historical trenches.
Mapping shows mineralisation sits in a blue quartz-eye granodiorite within a network of shear veins, subvertical tension veins, and stockwork zones. Pyrite, iron alteration, and locally visible gold accompany the veins.
The company has prioritised coarse-gold testing after the summer program returned widespread elevated grades.
CEO Jonathan Hamel says the assay data justifies the transition to deeper drilling.
“These results confirm the presence of high-grade gold across a large part of the areas sampled at Golden Island,” Hamel says.
“With nine samples above 10g/t Au and the recurring presence of coarse gold, we are now moving to drilling.”
Mosaic Minerals is a Canadian explorer advancing a portfolio of gold and nickel assets across Québec’s Abitibi and James Bay regions, including the Amanda and Gaboury projects.
Write to JC Villarba at Mining.com.au
Images: Mosaic Minerals
